check the fuse but i think the reverse light switch on the top of the gearbox might be the prob! if u know a bit about cars u can check this urself!! at the top of the gearbox (usually) there is a white looking part which is clipped or bolted on to the box where a multiplug is also on it, take the multiplug off and using a paperclip or bit of wire bridge the multiplug and switch the ignition on the lights should come on, if the do then the reverse switch req replaced if not then its a prob with the power to the switch but i reckon its the switch, remember to switch the ignition off be fore u touch the paperclip or wire as u may blow a fuse and get a wee shock of it